MY rooted Desire Z won't boot anymore

So last night I played too much Flappy Bird and became so annoyed with it that i took my knife( just to have a hard weapon, not the sharp edge) and started hitting my phone.

And now it does nothing, but weirdly, my charger always makes a sound when my phone is not plugged in and that sound stops when it's plugged in. And the sound stops when I plug my phone in but I don't know if it's charging or not because i've disabled the LED to turn on when charging.

The battery has some dents in it and the place where the battery is supposed to be has some big scratches and I think you can see the motherboard but that wouldn't be likely would it?

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